Safety valve



Phzz'p sw m 6 lar'Z h! firaess er- R 4 M SAFETY VALVE- P. G. DARLING ET AL Filed Aug. 11

May 13 1924.

Patented May 13, i924. if V i UNITED STATES PATENT oer-ice.

*rii'riirrb. DARLING AND H; GRAFssER, or BRIDGEPOBT, ooum iorrrcuw, As-

sIGNoBsTo MANNING, AXWELL & MOORE, INCL, OF NEW YoRxfN. Y'., A con- IGRATION'OF NEW JERSEY.

SAFETY VALVE.

A plication-filed August 11, 1921. Serial No. 491,614.

T all whom it may concern: F 'ig. 3 is a side elevation of the valve cas- Be it known that WeQPHILIP G. DARLING ing or cap: and

and CARL H. JGRAESSER, citizens of the Fig. 4 is a side elevation of the valve United States of America, and residentsof lifter lever before assembly.

5 Bridgeport, in the county of Fairfield and The numeral 1 indicates a calsting having State of Connecticut, have invented new and external screw threads at 2 whereby it ma useful Improvements in Safety Valves, of be secured to the boiler shell or fitting. which the following is a specification. This casting is provided with a centralbore This invention concerns safety valve de- 3 forming a steam passage, and at its up- "vices and relates more particularly to e per end is furnished with a series of spaced,

valve of that type commonly employed upon upwardly extending arms 4. Thesdarms 65 house heaters and the like, although in cerserve to support a ring 5 which may be taain aspects the invention is'of broaderapintegral with the arm'sif desired, and as plication. herein shown. The ring 5 is externally Valves of the type referred to, when inscrewthreaded as shown at 6. The casting stalled upon the ordinaryhouse boiler, are 1 D Q Q E pp for ai'bllshinfi 7 i 70 commonly under the supervision of peris secured therein in any desired manner. sons unskilled in mechanical matters and The upper edge of the bushing forms an it is thu'spartie hfly desirable that such annular valve seat asindicated at 8; (3ovalves should be of simple construction and operating with such valve seat is a mo oapa ble of withstanding rough usage. It able valve member comprising the disk 9 75 'is highly important, moreover, that such 'haviug'the depending guidefins 10 which valves'bemaintained in operative condition engage the interior surface of the sleeve di d 'readytwblow at theypr'operpressure, 7 and which serve to maintain, the diskin" and thus inmany communities it is required proper position" relativetothe seat surface byrlaw that'the"safety'valvesof house heatot the bushing; Projecting upwardly from 80 ersb so'sealedafter initial setting and inthe centerof the valve disk is a stem 11 spection"as' to'prevent readjustment of the which' serves to support an abutment disk spring' tel'lsionby theuser, while it is also 12 of adiameter substantially larger than 'requiredtha t some 'means be provided that'ofthe' stem. This abutment'clisk is whre'lfi the niovableva'lvemernberor feathpreferably provided at its upper surface es en may"be li'fted 'inanually from its seat with an upstand ng boss Y c se es I sat int v l tdflpfleye'ntjfbegirflingi tt hed to:center a coil compression spring 14 whose wit eat hytiugfllrggale; Final r llowerend bears against the upper surface 35 lheobjeet ofrthe present invention is to "of the abutmen't'rnember 12. i

provide an improved valve of 'theebove For hous ng the movable valve nember 0o typeyhavingfiovwand simp'le'partsg' which "and its-sprlng atcasingor shell 151s p1 owill' withstandrough usage" withoiit "suhvided. T'hlSCaSlng is preferab-lystamped stantial 'damagq -whnseiparts a'fter once 'tfrom Sheet metal and is of substantially being properly "adjuste'd cannot' readily' be eonoidahformf having asmhotharid un- 15 with fir flll h thgivi ifidieatiori of broken'outersurface'. This casing or'shell o5 'suchi'taet finddmvingw Vb, ve' lifter lever thuswconstitilltes an inverted cupwithin which cannotr beremoved without diswwhich the' spring andnvalwe are housed.

inimitling the entire valve devioe; [The 'lowerfportiorl or'inim of the shell is subm In th'e ahhompanyingiiirawiirgs "there' his stantiallyoylindrichl and'thisfi rtionis iniillustiated 'by way "of eurample lone-"form Itrnally= screw-threaded as in' 'icate'd at16. 1

of valve device designed-fon-carrfin the w'ihethrewds atlfi'extendior a co'nslderable tubove objents' into 'efi'eobj and in such d'rawviiistance'longitudinally 'df'the shelland are in t'w a' l'w' 'engageablefwiththethreads 6'11 nthering i g. his a vertical diametrical crossfsec- 52' The upper'orclosed end o thdoasing,

tibn' to large scale of the coinplte valve as ihdi'oated at l 'f, is'of substantiallyspheri- 10a device: oa'lcnrvaturer such end servin as'an abut- .29 is *passetlr 1 T the casing, the spring is automatically centered t erei A m ntaine gin x'al ali nment .ith" hfibfir? withrllit itatl ng the employment of any additional parts such asare commonly used in valves of or dinary construction. Moreover, by reason of the fact that the spring 14' bears directly against the inner surface of the housing, it is evident that by screwing the housing down onto the ring 5, the tension of the spring 14 may be varied. Thus the employment of special adjusting nuts or similar devices is made unnecessary.

A narrow vertical slot 18 is formedin the side wall of the casing 15, such slot serving for the reception ot a valve lifter lever 19. This lever comprising an inner arm which bears at the point 20 againstthe under side of the abutment member 12 and a second and longer arm 21 which extends in a generally vertical direction upon the outer side of the casing, and by means of which the lever may be manually actuated.

The valve lifter lever is preferably formed by stamping the'same from sheet metal and is provided with a tongue 23 which, when formed, lies substantially parallel to the edge 24 of the lever 19, as indicated in Fig. 4. After the casing 15 has been engaged with the ring 5, theend of the lever 19 is inserted through theslot 18 and by means of a suitable tool the tongue 23 is caused to diverge from the surface, 24 teen. extent sufiicient to prevent withdrawalof the lever throu h the opening 18, the free extremity of t e tongue 23 engaging the inner surface of the casing-15 at apoint below the lower end of such opening and thus serving toretain the le'venin operative position. After the c'asing 15 has been screwed down-upon the ring 5 to provide the desired s ringtension for the valve member, ;a ho 25 is drilled through the threaded portion of the casing,

such hole also extending through thering 5. This hole is preferably formed at a point immediately above orient the legs 4, as for example leg Band is thentapped for the reception of a screw 27. Upon lnsertion of thescrewlthe casing 15: is retained against rotation relatively to: the supporting casing d-arid thusthe tension ofthe spring'cannot be' varied without removing such screw."

iEEnw/order to revent surreptitious removal ,ot the screw 'y unauthorized e'rsons, the head of this'screw may be provided with a transverseopenin 28 througli'whieh a wire around the leg- 4 and itsendsmay 'then be secured-'togletherby means of any suitable V as-the lead-seall' 30. It is thus possiblertfioi' thednspeetor'whmsets the valve spring atfthe pro erwte'r'ision to seal the valveidevice in sue -a manneras'to show *viery; clearly: whether any attempt has been ,made'l to tamper'with the: --The casing 15, providing av smooth and unobstructed egrteniorsurfaee, is ca. able of withstanding eir-treme'lyrough usage; w ithou t'permitting any damage to the enclosed parts, while the .fact that theorising serves as theadjustmg igipg serves the slot; L8, it is unnecessary to provide a pivot pin therefor, thus again reducing the number of parts and the, operations necessary to the protection of a valve device'of the desiredcharacter. By breakingthe seal an inspector may remove the casingfor cleaning the valve parts, but in replacing the parts it is necessary to bring the opening 25 opposite the opening in the ring 5 in orderto reinsert the screw 27 and thus it is possible to reset the valve to the same tension as originally without necessitating the employment of a master gage in the resetting operation.

Having thus described the invention in a preferred embodiment of the same, whatil claim and desire to secure by Letters Patent of the U nited'States is:

,1. A valve device comprising a support,-a valve, a spring normally holding the valve closed, and a unitary thin walled shell enclosing the spring and constitutingq'an abutment for the upper fend of the lattergtsaid shell having a substantial] cylindrical lower portion engag'eable wit the support and conioalsidewalls extending upwardly from the cylindrical. portion-and merging into a spherically curved imperforate top.

2., A device comprising a support having a cylindrical externally threaded portion, a valve, a sprin normally kee ing the valve closed, anda s ell enclosing e spr'ing',smid shell having a substantially cylindrical lower portion internally threaded for engagementJwith the su .port, and conical walls extending upwardly from the cylindrical portion and merging into avsmo'othly rounded top. i r I i 3. A value :device comprising a (support,

a valve, a spring norm-ally; operative to keep the valveclosed, and a; casing. enclosing the spring, said casing consisting of a'n integral 'sheetmetal shelh of substantially conical iformf havingia rounded a x and a cylindrical r'impontionJtheroun ed apex of the shell bein- 'smooth-and'imperforate a' spherically ou'rved interior surface :forming an; abutment for i one end ofthespvingiv- 1Q 41 A valve 'devioebomprisin a' support having an externally threads portlomia flt valve, a spring for keeping it closed'l and a shell of sheet material enclosing the spring and forming an adjustable abutment forpne end of-bh spring whereby the tension of the spring may be regulated; said ill shell having an imperiorate upper end smoothly rounded externally and provided with a curved innersurface against which the spring seats, and an internally threaded portion engaging the threaded part of the support, said internally threaded portion being of a length to permit substantial adjustment of the upper end of the casing toward and from the support.

A safety valve device comprising a spring controlled valve, a hollow shell forming a casing therefor, said shell having a vertical slot of fixed length in its wall, and a valve lifting lever fulcrumed upon the edge of the shell at the lower end of said slot and having a divergent tongue engageable with the interior surface of the shell whereby to prevent withdrawal of the lever from the opening.

6. A safety valve device comprising a spring controlled valve, a hollow shell forming a casing therefor, said casing having a narrow slot of fixed length therethrough, and a valve lever fulcrumed upon the lower edge of said slot, said lever having an integral divergent tongue arranged within the casing and constructed and arranged to prevent withdrawal of the lever from the slot by engagement with the inner wall of the CilSlIlg at a point beyond the end of the s ot.

7. A safety valve device comprising a hollow casing, a valve within said casing, and a valve lifting lever associated with said valve, said lever projecting outwardly through a narrow slot of fixed length in said casing and having an integral tongue within the casing diverging from the main portion of the lever to an extent preventing withdrawal of the lever from said slot.

8. A valve device comprising an annular valve seat, a valve cooperable therewith, a spring for said valve, a casing for enclosing said valve and spring, said casing having a narrow vertical slot in its wall, a valve lifting lever of sheet material fulcrumed directly upon the edge of the casing proper at the lower end of the slot and having its inner end operatively connected to said valve and an integral tongue diverging from said inner end and having its free extremity constructed and arranged for engagement with the inner surface of the casing below the lower end of the slot.

9. A valve lifting lever having a valve engaging portion and a retaining tongue projecting therefrom, said tongue helng constructed and arranged to permit of its insertion together with the valve engaging portion of the lever through an openin in a valve casing, and then to be cause to diverge from said portion whereb to prevent withdrawal of said portion om the opening.

Si ned by us at Bridgeport, Conn, this 8th ay of August, 1921.

PHILIP G. DARLING. CARL H. GRAESSER. 

